Remove remnants of attempts to wrap to PHP global vars

This isn't really workable since PHP doesn't support intercepting
accesses to global variables (nor to static class properties, so
we can't wrap C/C++ global variables that way either).

The _get() and _set() function wrappers actually work and have
been generated for a very long time.

Lib/php/php.swg

@@ -10,7 +10,6 @@
 
 %include <phpinit.swg> // PHP initialization routine.
 
-%include <globalvar.i>	// Global variables.
 %include <const.i>
 
 // use %init %{ "/*code goes here*/ " %}